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There have been several wearable sensors that measure UV exposure: https://www.wearshade.com/articles/comparison-of-wearable-uv-sensors https://www.wearshade.c

• com2kid 4y ago
  Cool, I didn't realize anyone else had productized UV sensors. I wish the tech would hit mass market devices. > The technology is out there, you could probably build your own sensor using an Arduino and UVA and UVB sensors. Back in 2016 or so, we were able to order UV sensors, but since there was so little knowledge about how to use them on wearable, getting them to work was a challenge. It was months just to find a lens material that didn't block UV at all, but was also affordable, could be put on a production line, and fit all our consumer use cases (durable, chemical resistant, etc). The cards are cool, I forgot about them. It is unfortunate none of the main wearable players, by which I really just mean Apple, have bothered, but the UV sensor on Microsoft Band 2 was responsible for Band 2's not so friendly looking clasp, so I can't say I blame anyone for not wanting to go down that route again. Edit: FWIW our sensor gave us something, I forget what, but I remember it wasn't what we wanted, and we had to map it to UVI. From what I vaguely recall it was one of those things where we ordered a sensor, it says it did one thing, but the thing it actually did was related but not quite the same, so we had to create a mapping curve of some type. I came up with the user story and user flow for what we shipped, sun exposure reminders. We were really smart about it, we had logic in there to tell when you briefly went out of the sun, such as going to the bathroom, vs when you spent extended time inside, and we also worked to separate out walks to and from your car VS actually spending time outside. To take "breaks", I believe we had an accumulator and if you went out of the sun we started a timer and if the timer went off we reset the accumulator but if you went back into the sun the timer was cancelled. Actually starting the accumulator worked the same way, get out of car, exposure starts, if you didn't have so many minutes of continuous exposure, we never started the accumulator, an example is walking between buildings. Lots of use case design around what ended up being a couple of dialog boxes for a reminder to put on sun screen! Parents loved it though. :) Lots of positive feedback from parents who used it to track their family's sunscreen applications. Edit: From shade > 5 days of battery on a single charge Pretty sure if we just ran the UV sensor on band our battery life would've been forever and ever. :-D If that is a sales page, they need to list power draw of their sensor for various sampling rates, that is the only thing anyone cares about when it comes to integration.